fix cache

adlist/converter.py

@@ -162,6 +162,10 @@ def convert():
         # the final representation. It may return 304 only after validating
         # the complete content hash. Never use the source's validators.
         resp.make_conditional(request)
+        # Werkzeug adds Date during make_conditional(), while Uvicorn adds
+        # its own Date. Two Date fields make RustProxy 0.29.3 reject caching.
+        # Leave Date generation to the HTTP server, including for HTTP 304.
+        resp.headers.pop("Date", None)
         if resp.status_code == 304:
             result.output.close()
     redis_client.incr("stats:conversions_success")